CN111120119A - Control system and method of dual-fuel engine - Google Patents
Control system and method of dual-fuel engine Download PDFInfo
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- CN111120119A CN111120119A CN201911388683.1A CN201911388683A CN111120119A CN 111120119 A CN111120119 A CN 111120119A CN 201911388683 A CN201911388683 A CN 201911388683A CN 111120119 A CN111120119 A CN 111120119A
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- injection quantity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/16—End position calibration, i.e. calculation or measurement of actuator end positions, e.g. for throttle or its driving actuator
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention provides a control system and a method of a dual-fuel engine, wherein the control system comprises an original machine ECU and the dual-fuel ECU, under different working conditions, the dual-fuel ECU calculates the current substitution rate, the substitution ratio and the single-fuel theoretical original machine fuel injection quantity so as to obtain the theoretical original machine fuel injection quantity and the substitution fuel injection quantity, the substitution fuel injection quantity is used for controlling a substitution fuel injector, and the dual-fuel ECU obtains a virtual throttle signal according to the theoretical original machine fuel injection quantity and transmits the virtual throttle signal to the original machine ECU so as to control the original machine fuel injector. The invention can flexibly adjust the substitution rate of the dual fuel, does not need to modify the system of the dual fuel engine, has low cost and is beneficial to the popularization of the dual fuel engine.
Description
Technical Field
The invention belongs to the technical field of automobile engines, and particularly relates to a control system and method of a dual-fuel engine.
Background
The important source of the fuel oil of the internal combustion engine is petroleum, in recent years, the automobile reserve of China continuously increases at a high speed, meanwhile, the petroleum consumption is steadily improved, and in the face of the increasingly severe petroleum problem, the search for suitable automobile alternative energy is an important means for guaranteeing the healthy development of the automobile industry of China. Meanwhile, the emission regulation of the internal combustion engine is gradually strict and gradually moves to six stages of China, which is the most severe regulation worldwide at present. Finding an alternative fuel that improves the emissions performance of internal combustion engines is an effective means of dealing with more stringent regulations. With the development of technology, a plurality of dual-fuel products are produced, natural gas, alcohol fuel and hydrogen fuel become one of the dual-fuel products, and the products have certain advantages in the aspects of economy and emission compared with a single-fuel engine, so that the development of the dual-fuel engine has good economic advantages and environmental advantages.
At present, many dual-fuel products are modified on the basis of an original machine, and an alternative fuel supply system and an electronic control system are generally required to be additionally arranged for controlling the injection of the original machine fuel and the alternative fuel. Because the original engine ECU control program is mostly not open source, the specific control logic is unknown, the original engine fuel injection can not be directly controlled, and the existing solutions are roughly two types:
1) acquiring an original machine fuel injection signal through additional hardware equipment to judge the original machine fuel injection condition, further reducing the original machine fuel injection pulse width in proportion according to the substitution rate calculated by the dual-fuel ECU, and then outputting the original machine fuel injection signal to control an original machine fuel injector;
2) the two ECUs are connected through a real-time communication technology, the dual-fuel ECU receives an oil injection parameter signal of the original machine ECU, and then outputs an injection signal of the original machine fuel and an injection signal of the alternative fuel to control the dual-fuel injector.
However, the above two methods have respective limitations, and require additional hardware devices or are difficult to implement by the technology itself, so that the wide application of the dual-fuel engine is limited.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a dual-fuel engine control system and a control method, which can realize the control of the actual injection quantity of dual fuel in a newly added dual-fuel ECU without additionally adding hardware.
The technical scheme adopted by the invention is as follows.
A dual-fuel engine control method is characterized in that a dual-fuel ECU calculates the fuel injection quantity of a theoretical original engine and the fuel injection quantity of a substitute engine, the fuel injection quantity of the substitute engine is used for controlling a substitute fuel injector, the dual-fuel ECU obtains a virtual throttle signal according to the fuel injection quantity of the theoretical original engine and transmits the virtual throttle signal to the original engine ECU, and then the original engine fuel injector is controlled.
Further, the theoretical original engine fuel injection quantity is (1-substitution rate) × single-fuel theoretical original engine fuel injection quantity, and the substitution rate and the single-fuel theoretical original engine fuel injection quantity are obtained by querying the corresponding MAP MAPs.
Further, the substitute fuel injection quantity is a substitute ratio of the theoretical original fuel injection quantity, and the substitute ratio is obtained by referring to the corresponding MAP.
Further, the acquiring process of the virtual throttle signal is as follows: the dual fuel ECU maps the theoretical original engine fuel injection quantity to the throttle position of the original engine ECU.
Furthermore, the mapping mode is that the performance result of the dual-fuel engine is obtained through a calibration test of the dual-fuel engine, a MAP (MAP) of the theoretical original engine fuel injection quantity corresponding to the original engine ECU accelerator position is obtained, and the mapping is completed by checking the MAP.
Further, the transmission process of the virtual throttle signal is as follows: the dual-fuel ECU outputs the analog quantity signal to the original engine ECU.
A dual-fuel engine control system comprises a sensor, a controller and an actuator, wherein the controller comprises an original engine ECU and a dual-fuel ECU, the dual-fuel ECU comprises a signal acquisition module, a working condition judgment module, an engine management module and an execution module, the engine management module receives signals of the signal acquisition module, calculates theoretical original engine fuel injection quantity and substitute fuel injection quantity, and the theoretical original engine fuel injection quantity is mapped to an original engine throttle position to obtain a virtual throttle signal.
In the technical scheme, the signals acquired by the original ECU comprise the crankshaft position, the camshaft position, the cooling water temperature, the air inlet pressure and the air inlet temperature at the air inlet pipe.
The invention has the beneficial effects that:
(1) the invention provides a dual-fuel engine control system which comprises an original engine ECU and a dual-fuel ECU, wherein the dual-fuel ECU directly controls a substitute fuel injector, and the dual-fuel ECU also transmits a virtual throttle signal to the original engine ECU, so that the original engine fuel injector is controlled. According to the invention, the dual-fuel substitution rate can be flexibly adjusted only by the dual-fuel ECU, wherein accurate test data ensure the accuracy of the actual injection quantity control of the dual fuels.
(2) The invention also provides a control method of the dual-fuel engine, the dual-fuel ECU transmits the virtual throttle signal to the original engine ECU to control the original engine fuel injector, and the virtual throttle signal is obtained by mapping the theoretical original engine fuel injection quantity to the throttle position of the original engine ECU by the dual-fuel ECU. The invention realizes the flexible control of the actual injection quantity of the dual fuel from the angle of signal input, does not need to carry out additional hardware modification on a dual fuel engine system compared with the prior art, is very convenient in technical realization, has low realization cost and is beneficial to the wide application of the dual fuel engine.
Drawings
FIG. 1 is a schematic structural diagram of a dual fuel engine control system of the present invention;
FIG. 2 is a circuit diagram of the original engine ECU and the dual fuel ECU of the present invention;
FIG. 3 is a flow chart of a dual fuel engine control method of the present invention.
Detailed Description
The technical solutions of the present invention are described in detail below with reference to the drawings and examples, but the scope of the present invention is not limited thereto.
The terms to be described in the present invention are defined as follows: the substitution rate refers to the percentage of the original engine fuel injection quantity replaced by the substitution fuel injection quantity under the condition of ensuring the power of the engine; the replacement ratio is the number of replaced fuel injection amounts corresponding to each replaced original engine fuel injection amount under the condition that the engine power is guaranteed.
As shown in fig. 1, the dual-fuel engine control system comprises a sensor, a controller and an actuator, wherein the sensor comprises a crankshaft sensor, a camshaft sensor, a cooling water temperature sensor, an intake pressure temperature sensor and a throttle position sensor, the controller comprises a primary engine ECU and a dual-fuel ECU, and the actuator comprises a primary engine fuel injector and an alternative fuel injector. The engine comprises a crankshaft sensor, a camshaft sensor, a cooling water temperature sensor, an air inlet pressure temperature sensor and a dual-fuel ECU (electronic control unit) wire harness, wherein the crankshaft sensor, the camshaft sensor, the cooling water temperature sensor, the air inlet pressure temperature sensor and the throttle position sensor are connected with the original engine ECU wire harness, the crankshaft sensor is used for acquiring a crankshaft position signal, the camshaft sensor is used for acquiring a camshaft position signal, the cooling water temperature sensor is used for acquiring the temperature of cooling water, the air inlet pressure temperature sensor is used for acquiring the air inlet pressure and the air inlet temperature of an air inlet pipe, and the throttle position sensor is used for acquiring the throttle. The dual-fuel ECU obtains the injection parameters of the alternative fuel and the virtual throttle signal transmitted to the original machine ECU according to the crankshaft position signal, the camshaft position signal, the temperature of the cooling water, the air inlet pressure and the air inlet temperature at the air inlet pipe and the throttle position, and the injection parameters of the alternative fuel are used for controlling the alternative fuel injector; and the original engine ECU obtains the injection parameters of the original engine fuel according to the crankshaft position signal, the camshaft position signal, the temperature of cooling water, the air inlet pressure and the air inlet temperature at the air inlet pipe and the virtual throttle signal, and controls the original engine fuel injector to work.
The dual-fuel ECU comprises a signal acquisition module, a working condition judgment module, an engine management module and an execution module, wherein the signal acquisition module is used for acquiring signals acquired by a sensor and transmitting the signals to the working condition judgment module to determine the working condition of the engine, the engine management module receives the signals sent by the signal acquisition module and calculates the current substitution rate, the theoretical original machine fuel injection quantity and the substitution fuel injection quantity, the execution module comprises a virtual throttle signal and a substitution fuel injector control signal, the substitution fuel injector control signal is acquired by the substitution fuel injection quantity, and the virtual throttle signal is acquired by mapping the theoretical original machine fuel injection quantity to the original machine throttle position.
As shown in fig. 2, the original machine ECU and the dual-fuel ECU are connected in circuit, a sensor power supply port 1 of the dual-fuel ECU is connected with a power supply port 1 of the original machine ECU by a wire harness, an analog quantity output port 1 of the dual-fuel ECU (outputting an analog quantity signal of 0-5V) is connected with a signal port 1 of the original machine ECU by a wire harness, a sensor power supply negative port 1 of the dual-fuel ECU is connected with a ground port 1 of the original machine ECU by a wire harness, a sensor power supply port 2 of the dual-fuel ECU is connected with a power supply port 2 of the original machine ECU by a wire harness, an analog quantity output port 2 of the dual-fuel ECU (outputting an analog quantity signal of 0-2.5V) is connected with a signal port 2 of the original machine ECU by a wire harness, and a sensor power.
As shown in fig. 3, the dual-fuel engine control method of the present invention specifically includes the following steps:
1) the dual-fuel ECU judges the working conditions of the engine, including a stopping working condition, a starting working condition, an idling working condition, a normal running working condition, a rapid acceleration working condition, a rapid deceleration working condition and an overspeed working condition, according to the current rotating speed (obtained by calculating the position of a crankshaft and the position of a camshaft); meanwhile, by inquiring a single fuel mode original machine fuel injection quantity MAP graph, a substitution rate MAP graph and a substitution rate MAP graph, under different working conditions, calculating the current substitution rate, the single fuel theoretical original machine fuel injection quantity, the theoretical original machine fuel injection quantity and the substitution fuel injection quantity, wherein the theoretical original machine fuel injection quantity is (1-substitution rate) the single fuel theoretical original machine fuel injection quantity, and the substitution fuel injection quantity is the theoretical original machine fuel injection quantity and the substitution rate is the substitution rate;
2) the dual-fuel ECU converts the alternative fuel injection quantity into a pulse width signal to control the alternative fuel injector; the dual-fuel ECU transmits the virtual throttle signal to the original ECU, and the transmission process of the virtual throttle signal is as follows: the analog quantity output port 1 of the dual-fuel ECU outputs 0-5V analog quantity signals, the analog quantity output port 2 outputs 0-2.5V analog quantity signals, the signal port of the original engine ECU acquires the analog quantity signals (namely original engine throttle position signals), and the original engine ECU throttle position is acquired according to an original engine throttle position signal MAP. The virtual throttle signal acquisition process comprises the following steps: the dual-fuel ECU MAPs the theoretical original engine fuel injection quantity to the accelerator position of the original engine ECU, the specific mapping mode is that the performance result (such as fuel consumption rate and the like) of the dual-fuel engine is obtained through the calibration test of the dual-fuel engine, namely, a MAP (namely a virtual accelerator signal mapping MAP) of the theoretical original engine fuel injection quantity corresponding to the accelerator position of the original engine ECU is calibrated at the corresponding engine speed, and the mapping process is completed by the action of checking the MAP. Particularly, because the mapping process has differences under different environments, an environment correction coefficient is required to be added in the mapping process to ensure the environmental adaptability, the environment correction coefficient is also obtained from a calibration test, the environment correction coefficient comprises cooling water temperature, intake air temperature and intake air pressure, and the environment correction coefficient mainly participates in the calculation of the virtual throttle signal in a multiplication mode.
3) The original engine ECU receives a virtual throttle signal sent by the dual-fuel ECU, judges the working conditions of the engine (including a stopping working condition, a starting working condition, an idling working condition, a normal running working condition, a rapid acceleration working condition, a rapid deceleration working condition and an overspeed working condition) according to the current rotating speed, calculates the injection quantity of the original engine fuel under different working conditions, and outputs a control signal to the original engine fuel injector for execution.
In this embodiment, regardless of the determination of the correction coefficient or the determination of the MAP, a reliable test result is required, the accuracy of the test result has a great influence on the control accuracy of the control method of the present invention, and only the accurate test result can accurately control the actual dual fuel injection amount.
According to the invention, different ECUs are used for respectively controlling the injection of two fuels, the dual-fuel substitution rate is determined according to the actual working condition, and the dual-fuel substitution rate can be flexibly adjusted on only one ECU through a virtual accelerator signal based on the calibration test result so as to control the actual injection quantity of the dual fuels; the invention does not need to modify any hardware of the original dual-fuel system, thereby achieving the purpose of controlling the actual injection quantity of the dual fuel.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (8)
1. A control method of a dual-fuel engine is characterized in that a dual-fuel ECU calculates the fuel injection quantity of a theoretical original engine and the fuel injection quantity of a substitute engine, the fuel injection quantity of the substitute engine is used for controlling a substitute fuel injector, the dual-fuel ECU obtains a virtual throttle signal according to the fuel injection quantity of the theoretical original engine and transmits the virtual throttle signal to the original engine ECU, and then the original engine fuel injector is controlled.
2. The dual fuel engine control method of claim 1, wherein the theoretical raw engine fuel injection quantity is (1-substitution rate) a single fuel theoretical raw engine fuel injection quantity, and the substitution rate and the single fuel theoretical raw engine fuel injection quantity are both obtained by referring to respective MAP MAPs.
3. The dual fuel engine control method of claim 2, wherein the substitution fuel injection quantity is a theoretical original fuel injection quantity substitution rate substitution ratio, and the substitution ratio is obtained by referring to a corresponding MAP.
4. The dual-fuel engine control method as claimed in claim 1, characterized in that the virtual throttle signal is obtained by: the dual fuel ECU maps the theoretical original engine fuel injection quantity to the throttle position of the original engine ECU.
5. The dual-fuel engine control method of claim 2, wherein the mapping mode is that a performance result of the dual-fuel engine is obtained through a calibration test of the dual-fuel engine, a MAP of the theoretical original engine fuel injection quantity corresponding to the original engine ECU throttle position is obtained, and the mapping is completed by checking the MAP.
6. The dual-fuel engine control method as claimed in claim 1, characterized in that the virtual throttle signal is transmitted by: the dual-fuel ECU outputs the analog quantity signal to the original engine ECU.
7. The dual-fuel engine control system is characterized by comprising a sensor, a controller and an actuator, wherein the controller comprises an original engine ECU and a dual-fuel ECU, the dual-fuel ECU comprises a signal acquisition module, a working condition judgment module, an engine management module and an execution module, the engine management module receives signals of the signal acquisition module, calculates the fuel injection quantity and the alternative fuel injection quantity of a theoretical original engine, and maps the fuel injection quantity of the theoretical original engine to the position of an original engine throttle to acquire a virtual throttle signal.
8. The dual fuel engine control system as claimed in claim 7, wherein the signals obtained by the original ECU include a crankshaft position, a camshaft position, a cooling water temperature, an intake air pressure at an intake pipe, and an intake air temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911388683.1A CN111120119A (en) | 2019-12-30 | 2019-12-30 | Control system and method of dual-fuel engine |
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| CN201911388683.1A CN111120119A (en) | 2019-12-30 | 2019-12-30 | Control system and method of dual-fuel engine |
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| CN111120119A true CN111120119A (en) | 2020-05-08 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113281054A (en) * | 2021-05-10 | 2021-08-20 | 常州易控汽车电子股份有限公司 | Methanol-diesel dual fuel substitution rate pre-calibration method |
| CN114592977A (en) * | 2022-02-23 | 2022-06-07 | 上海和夏骏智科技有限公司 | Dual-fuel engine control method and system |
| US20230243296A1 (en) * | 2021-07-01 | 2023-08-03 | Taiyuan University Of Technology | Dual-fuel intelligent combustion system and control method thereof |
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| CN109184903A (en) * | 2018-10-31 | 2019-01-11 | 福州大学 | The quasi-Homogeneous charge of multi-point injection is calmed the anger liquid electric control system of dual-fuel engine |
| US20190271272A1 (en) * | 2018-03-02 | 2019-09-05 | Michael A. Schiltz | Mixed fuel system |
| CN210799153U (en) * | 2019-10-29 | 2020-06-19 | 卓品智能科技无锡有限公司 | Methanol controller system applied to diesel and methanol dual-fuel engine |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104454189A (en) * | 2014-12-19 | 2015-03-25 | 中国汽车工程研究院股份有限公司 | Double-fuel control method for high-pressure common-rail fuel injection system |
| US20190271272A1 (en) * | 2018-03-02 | 2019-09-05 | Michael A. Schiltz | Mixed fuel system |
| CN109184903A (en) * | 2018-10-31 | 2019-01-11 | 福州大学 | The quasi-Homogeneous charge of multi-point injection is calmed the anger liquid electric control system of dual-fuel engine |
| CN210799153U (en) * | 2019-10-29 | 2020-06-19 | 卓品智能科技无锡有限公司 | Methanol controller system applied to diesel and methanol dual-fuel engine |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113281054A (en) * | 2021-05-10 | 2021-08-20 | 常州易控汽车电子股份有限公司 | Methanol-diesel dual fuel substitution rate pre-calibration method |
| US20230243296A1 (en) * | 2021-07-01 | 2023-08-03 | Taiyuan University Of Technology | Dual-fuel intelligent combustion system and control method thereof |
| US11834984B2 (en) * | 2021-07-01 | 2023-12-05 | Taiyuan University Of Technology | Dual-fuel intelligent combustion system and control method thereof |
| CN114592977A (en) * | 2022-02-23 | 2022-06-07 | 上海和夏骏智科技有限公司 | Dual-fuel engine control method and system |
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